330 lines
11 KiB
C
330 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Data Access Monitor Unit Tests
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*
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* Copyright 2019 Amazon.com, Inc. or its affiliates. All rights reserved.
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*
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* Author: SeongJae Park <sjpark@amazon.de>
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*/
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#ifdef CONFIG_DAMON_VADDR_KUNIT_TEST
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#ifndef _DAMON_VADDR_TEST_H
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#define _DAMON_VADDR_TEST_H
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#include <kunit/test.h>
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static void __link_vmas(struct vm_area_struct *vmas, ssize_t nr_vmas)
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{
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int i, j;
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unsigned long largest_gap, gap;
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if (!nr_vmas)
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return;
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for (i = 0; i < nr_vmas - 1; i++) {
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vmas[i].vm_next = &vmas[i + 1];
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vmas[i].vm_rb.rb_left = NULL;
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vmas[i].vm_rb.rb_right = &vmas[i + 1].vm_rb;
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largest_gap = 0;
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for (j = i; j < nr_vmas; j++) {
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if (j == 0)
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continue;
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gap = vmas[j].vm_start - vmas[j - 1].vm_end;
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if (gap > largest_gap)
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largest_gap = gap;
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}
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vmas[i].rb_subtree_gap = largest_gap;
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}
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vmas[i].vm_next = NULL;
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vmas[i].vm_rb.rb_right = NULL;
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vmas[i].rb_subtree_gap = 0;
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}
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/*
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* Test __damon_va_three_regions() function
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*
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* In case of virtual memory address spaces monitoring, DAMON converts the
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* complex and dynamic memory mappings of each target task to three
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* discontiguous regions which cover every mapped areas. However, the three
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* regions should not include the two biggest unmapped areas in the original
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* mapping, because the two biggest areas are normally the areas between 1)
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* heap and the mmap()-ed regions, and 2) the mmap()-ed regions and stack.
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* Because these two unmapped areas are very huge but obviously never accessed,
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* covering the region is just a waste.
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*
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* '__damon_va_three_regions() receives an address space of a process. It
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* first identifies the start of mappings, end of mappings, and the two biggest
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* unmapped areas. After that, based on the information, it constructs the
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* three regions and returns. For more detail, refer to the comment of
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* 'damon_init_regions_of()' function definition in 'mm/damon.c' file.
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*
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* For example, suppose virtual address ranges of 10-20, 20-25, 200-210,
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* 210-220, 300-305, and 307-330 (Other comments represent this mappings in
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* more short form: 10-20-25, 200-210-220, 300-305, 307-330) of a process are
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* mapped. To cover every mappings, the three regions should start with 10,
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* and end with 305. The process also has three unmapped areas, 25-200,
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* 220-300, and 305-307. Among those, 25-200 and 220-300 are the biggest two
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* unmapped areas, and thus it should be converted to three regions of 10-25,
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* 200-220, and 300-330.
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*/
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static void damon_test_three_regions_in_vmas(struct kunit *test)
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{
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struct damon_addr_range regions[3] = {0,};
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/* 10-20-25, 200-210-220, 300-305, 307-330 */
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struct vm_area_struct vmas[] = {
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(struct vm_area_struct) {.vm_start = 10, .vm_end = 20},
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(struct vm_area_struct) {.vm_start = 20, .vm_end = 25},
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(struct vm_area_struct) {.vm_start = 200, .vm_end = 210},
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(struct vm_area_struct) {.vm_start = 210, .vm_end = 220},
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(struct vm_area_struct) {.vm_start = 300, .vm_end = 305},
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(struct vm_area_struct) {.vm_start = 307, .vm_end = 330},
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};
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__link_vmas(vmas, 6);
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__damon_va_three_regions(&vmas[0], regions);
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KUNIT_EXPECT_EQ(test, 10ul, regions[0].start);
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KUNIT_EXPECT_EQ(test, 25ul, regions[0].end);
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KUNIT_EXPECT_EQ(test, 200ul, regions[1].start);
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KUNIT_EXPECT_EQ(test, 220ul, regions[1].end);
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KUNIT_EXPECT_EQ(test, 300ul, regions[2].start);
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KUNIT_EXPECT_EQ(test, 330ul, regions[2].end);
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}
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static struct damon_region *__nth_region_of(struct damon_target *t, int idx)
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{
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struct damon_region *r;
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unsigned int i = 0;
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damon_for_each_region(r, t) {
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if (i++ == idx)
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return r;
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}
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return NULL;
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}
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/*
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* Test 'damon_va_apply_three_regions()'
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*
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* test kunit object
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* regions an array containing start/end addresses of current
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* monitoring target regions
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* nr_regions the number of the addresses in 'regions'
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* three_regions The three regions that need to be applied now
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* expected start/end addresses of monitoring target regions that
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* 'three_regions' are applied
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* nr_expected the number of addresses in 'expected'
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*
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* The memory mapping of the target processes changes dynamically. To follow
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* the change, DAMON periodically reads the mappings, simplifies it to the
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* three regions, and updates the monitoring target regions to fit in the three
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* regions. The update of current target regions is the role of
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* 'damon_va_apply_three_regions()'.
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*
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* This test passes the given target regions and the new three regions that
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* need to be applied to the function and check whether it updates the regions
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* as expected.
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*/
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static void damon_do_test_apply_three_regions(struct kunit *test,
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unsigned long *regions, int nr_regions,
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struct damon_addr_range *three_regions,
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unsigned long *expected, int nr_expected)
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{
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struct damon_ctx *ctx = damon_new_ctx();
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struct damon_target *t;
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struct damon_region *r;
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int i;
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t = damon_new_target(42);
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for (i = 0; i < nr_regions / 2; i++) {
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r = damon_new_region(regions[i * 2], regions[i * 2 + 1]);
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damon_add_region(r, t);
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}
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damon_add_target(ctx, t);
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damon_va_apply_three_regions(t, three_regions);
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for (i = 0; i < nr_expected / 2; i++) {
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r = __nth_region_of(t, i);
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KUNIT_EXPECT_EQ(test, r->ar.start, expected[i * 2]);
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KUNIT_EXPECT_EQ(test, r->ar.end, expected[i * 2 + 1]);
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}
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damon_destroy_ctx(ctx);
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}
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/*
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* This function test most common case where the three big regions are only
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* slightly changed. Target regions should adjust their boundary (10-20-30,
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* 50-55, 70-80, 90-100) to fit with the new big regions or remove target
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* regions (57-79) that now out of the three regions.
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*/
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static void damon_test_apply_three_regions1(struct kunit *test)
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{
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/* 10-20-30, 50-55-57-59, 70-80-90-100 */
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unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59,
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70, 80, 80, 90, 90, 100};
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/* 5-27, 45-55, 73-104 */
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struct damon_addr_range new_three_regions[3] = {
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(struct damon_addr_range){.start = 5, .end = 27},
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(struct damon_addr_range){.start = 45, .end = 55},
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(struct damon_addr_range){.start = 73, .end = 104} };
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/* 5-20-27, 45-55, 73-80-90-104 */
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unsigned long expected[] = {5, 20, 20, 27, 45, 55,
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73, 80, 80, 90, 90, 104};
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damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions),
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new_three_regions, expected, ARRAY_SIZE(expected));
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}
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/*
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* Test slightly bigger change. Similar to above, but the second big region
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* now require two target regions (50-55, 57-59) to be removed.
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*/
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static void damon_test_apply_three_regions2(struct kunit *test)
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{
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/* 10-20-30, 50-55-57-59, 70-80-90-100 */
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unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59,
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70, 80, 80, 90, 90, 100};
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/* 5-27, 56-57, 65-104 */
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struct damon_addr_range new_three_regions[3] = {
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(struct damon_addr_range){.start = 5, .end = 27},
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(struct damon_addr_range){.start = 56, .end = 57},
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(struct damon_addr_range){.start = 65, .end = 104} };
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/* 5-20-27, 56-57, 65-80-90-104 */
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unsigned long expected[] = {5, 20, 20, 27, 56, 57,
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65, 80, 80, 90, 90, 104};
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damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions),
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new_three_regions, expected, ARRAY_SIZE(expected));
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}
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/*
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* Test a big change. The second big region has totally freed and mapped to
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* different area (50-59 -> 61-63). The target regions which were in the old
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* second big region (50-55-57-59) should be removed and new target region
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* covering the second big region (61-63) should be created.
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*/
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static void damon_test_apply_three_regions3(struct kunit *test)
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{
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/* 10-20-30, 50-55-57-59, 70-80-90-100 */
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unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59,
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70, 80, 80, 90, 90, 100};
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/* 5-27, 61-63, 65-104 */
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struct damon_addr_range new_three_regions[3] = {
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(struct damon_addr_range){.start = 5, .end = 27},
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(struct damon_addr_range){.start = 61, .end = 63},
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(struct damon_addr_range){.start = 65, .end = 104} };
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/* 5-20-27, 61-63, 65-80-90-104 */
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unsigned long expected[] = {5, 20, 20, 27, 61, 63,
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65, 80, 80, 90, 90, 104};
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damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions),
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new_three_regions, expected, ARRAY_SIZE(expected));
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}
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/*
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* Test another big change. Both of the second and third big regions (50-59
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* and 70-100) has totally freed and mapped to different area (30-32 and
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* 65-68). The target regions which were in the old second and third big
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* regions should now be removed and new target regions covering the new second
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* and third big regions should be crated.
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*/
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static void damon_test_apply_three_regions4(struct kunit *test)
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{
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/* 10-20-30, 50-55-57-59, 70-80-90-100 */
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unsigned long regions[] = {10, 20, 20, 30, 50, 55, 55, 57, 57, 59,
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70, 80, 80, 90, 90, 100};
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/* 5-7, 30-32, 65-68 */
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struct damon_addr_range new_three_regions[3] = {
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(struct damon_addr_range){.start = 5, .end = 7},
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(struct damon_addr_range){.start = 30, .end = 32},
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(struct damon_addr_range){.start = 65, .end = 68} };
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/* expect 5-7, 30-32, 65-68 */
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unsigned long expected[] = {5, 7, 30, 32, 65, 68};
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damon_do_test_apply_three_regions(test, regions, ARRAY_SIZE(regions),
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new_three_regions, expected, ARRAY_SIZE(expected));
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}
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static void damon_test_split_evenly(struct kunit *test)
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{
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struct damon_ctx *c = damon_new_ctx();
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struct damon_target *t;
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struct damon_region *r;
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unsigned long i;
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KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(NULL, NULL, 5),
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-EINVAL);
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t = damon_new_target(42);
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r = damon_new_region(0, 100);
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KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(t, r, 0), -EINVAL);
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damon_add_region(r, t);
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KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(t, r, 10), 0);
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KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 10u);
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i = 0;
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damon_for_each_region(r, t) {
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KUNIT_EXPECT_EQ(test, r->ar.start, i++ * 10);
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KUNIT_EXPECT_EQ(test, r->ar.end, i * 10);
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}
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damon_free_target(t);
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t = damon_new_target(42);
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r = damon_new_region(5, 59);
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damon_add_region(r, t);
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KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(t, r, 5), 0);
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KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 5u);
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i = 0;
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damon_for_each_region(r, t) {
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if (i == 4)
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break;
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KUNIT_EXPECT_EQ(test, r->ar.start, 5 + 10 * i++);
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KUNIT_EXPECT_EQ(test, r->ar.end, 5 + 10 * i);
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}
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KUNIT_EXPECT_EQ(test, r->ar.start, 5 + 10 * i);
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KUNIT_EXPECT_EQ(test, r->ar.end, 59ul);
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damon_free_target(t);
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t = damon_new_target(42);
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r = damon_new_region(5, 6);
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damon_add_region(r, t);
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KUNIT_EXPECT_EQ(test, damon_va_evenly_split_region(t, r, 2), -EINVAL);
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KUNIT_EXPECT_EQ(test, damon_nr_regions(t), 1u);
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damon_for_each_region(r, t) {
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KUNIT_EXPECT_EQ(test, r->ar.start, 5ul);
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KUNIT_EXPECT_EQ(test, r->ar.end, 6ul);
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}
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damon_free_target(t);
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damon_destroy_ctx(c);
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}
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static struct kunit_case damon_test_cases[] = {
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KUNIT_CASE(damon_test_three_regions_in_vmas),
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KUNIT_CASE(damon_test_apply_three_regions1),
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KUNIT_CASE(damon_test_apply_three_regions2),
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KUNIT_CASE(damon_test_apply_three_regions3),
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KUNIT_CASE(damon_test_apply_three_regions4),
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KUNIT_CASE(damon_test_split_evenly),
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{},
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};
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static struct kunit_suite damon_test_suite = {
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.name = "damon-primitives",
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.test_cases = damon_test_cases,
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};
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kunit_test_suite(damon_test_suite);
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#endif /* _DAMON_VADDR_TEST_H */
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#endif /* CONFIG_DAMON_VADDR_KUNIT_TEST */
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